K-MAN

Hey Folks,

Just purchased a 2001, 312 Fastech, "SUPER CLEAN" with
190 hours! The only problem I'm concerned with is the engines. 7.4(454) MPI's with Bravo One Drives. I know the
engines are not performance type that I have had in the past,
but more like workhorse engines, 310HP. Alot of room to play
with here. The drives have 4 blade 28 pitch props, would
like to know if I need to change these out to get a little more
punch out of the hole or just leave well enough alone? Any help and suggestions and what to look out for are appreciated.

K-Man

mopower

I'd only change props if top end was under 4400 rpms or over 5000 rpm. You can usually improve your hole shot by going down in pitch but deep Vs aren't ones noted for getting up quick anyway.

Downtown42

More hole shot may loose top end. I agree with Mopower, but you should be close to 5000 at WOT.

http://www.go-fast.com/Prop_Slip_Calculator.htm

Downtown42

where's the pix?

t500hps

I'm selling a 1998 312 with the 502's (415 HP), running 30 pitch props she hits 73-74 GPS on a good day. You must be low 60's on GPS.....Should have bought mine...
Anyway, I'm suprised you are spinning 28's. As others have said, what's your max RPM?

mopower

Could have lower gears.

t500hps

I'm running 1.65's, wouldn't 1.5's reduce the pitch even more?

K-MAN

Here it is!

454's MPI's, 310HP, Bravo One Drives, 1.65 Ratio, 4 Blade 28 Pitch Prop
Guessing She'll Run About Low to Mid 60's?

t500hps

NICE!
just took a deposit on my 1998. 502/415's, 1.65 drives with 30's.